You have to get three stars next to your account. To do this you have to 1) Beat the game 2) Finish all levels and 3) spend all star coins. You can find a guide for new Super Mario bros Here: http://guides.ign.com/guides/682879/
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They call it Super Mario Bros Wii for a reason
Get all the star coins.
Mario Bros. Super Mario Bros. Super Mario Bros. 2 Super Mario Bros. 3 Super Mario World Super Mario Land Super Mario World 2 Super Mario Land 2 Super Mario 64 Super Mario Sunshine New Super Mario Bros. Super Mario Galaxy New Super Mario Bros. Wii Super Mario Galaxy 2
beat and unlock all the other levels. my mom is the Mario master
Baby Mario is a trophy, not a character. You can't use him.